I am planning to install a t3,t4 kit on b18c with ycp piston. want to boost 10-12psi
I wonder to know what map sensor and how much CC injector good for it? How many horsepower i will get with this set up?

 

What engine management and what fuel will you be using? Assuming you'll be using the typical Hondata/Neptune/etc. and running E85 for fuel, I would recommend using a 4 bar MAP and some 1,000cc/min Bosch EV14 injectors. The 4 bar MAP's are common these days and with correct dead times, the injectors will idle like stock and can support up to about 400 whp.

 

For 10-12 PSI you are at about 2 bar already, so at least a 3 bar MAP sensor. I've used a GM 3BAR map sensor before and worked good when I was boosting about 20-22 psi. You can go with a 4 bar map sensor, I'm not sure the brand or type, so that if you increase boost up to 29.4 PSI, you won't be maxed out with a 3 BAR MAP sensor.
Fuel injectors- at least 660 or 720cc, but 880 would be good to give you room for improvement later on. You can do 1000cc injectors and they should work good when tuned. I had Precision 1000cc injectors, and they worked good a few years until I didn't have the car anymore.
How much power- on 10-12 psi you should be looking at 260 or so WHP.